炉顶煤气循环—氧气鼓风高炉综合数学模型

Comprehensive mathematical model of top gas recycling-oxygen blast furnaces

为了研究开发炉顶煤气循环μ氧气鼓风高炉炼铁新工艺,建立其综合数学模型.模型由高炉各个区域煤气成分计算方程、高炉上部空区热平衡模型、热化学平衡模型和炉身效率模型组成.用此模型计算了该炼铁工艺的基本工艺参数.结果表明:新工艺的焦比为200 kg.t-1,煤比为200 kg.t-1,相比传统高炉,燃料比降低22.9%;风口循环煤气量对风口理论燃烧温度影响较大,风口循环煤气量每增加10m3.t-1时,风口理论燃烧温度降低17.6K.此外,应用此模型还可以计算任何原料和燃料等条件下的炼铁工艺参数,研究相同原料和燃料条件下的各个工艺参数的变化规律.

A comprehensive mathematical model was established to develop a new iron-making process for a top gas recycling and oxygen blast furnace.The model consists of the calculation equations for gas composition of each area in the blast furnace,the thermal equilibrium model on the top skip area of the blast furnace,the thermo-chemical balance model,and the stack efficiency model.Operating parameters for the new iron-making process were calculated with the model.The results show that the coke rate and the coal rate of the new iron-making process are both 200 kg·t-1,and in comparison with a traditional blast furnace,the fuel ratio decreases by 22.9%.In addition,the tuyere circulation gas quantity has great influence on the theoretical combustion temperature.When the tuyere circulation gas quantity increases by 10m3·t-1,the theoretical combustion temperature decreases by 17.6K.Furthermore,the model could be applied to calculate the operating parameters when the raw materials and fuel conditions are different,and the change laws of operating parameters under the same raw materials and fuel conditions also could be studied with this model.